Chirality and circular dichroism of oriented molecules and anisotropic phases

The results of the "Chirality measurement" circular dichroism along differe nt viewing directions within molecules and phases-the anisotropy of circula r dichroism can give suitable information in order to check helicity rules or to analyze the suprastructural chirality of films of organic materials, respectively. These results of the ACD spectroscopy (the CD of anisotropic phases and oriented molecules) show that in an oriented state different inf ormation about "chirality" will be gained from different viewing directions . ACD measurements of alpha,beta-unsaturated ketosteroids, TADDOLes and bin aphthol derivatives were analyzed. The chiral induction of cholesteric phas es, the helical twisting power, is introduced as another chirality measurem ent which may possibly be a new relative method for the determination of th e absolute configuration. (C) 2000 Wiley-Liss. Inc.